Kalabalık Fahrettin, Aktaş Tunahan, Akan Ender, Aytuğar Emre
Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Izmir Katip Celebi University, IzmirTurkey.
Department of Prosthodontics, Faculty of Dentistry, İzmir Katip Çelebi University, IzmirTurkey.
J Oral Maxillofac Res. 2020 Dec 31;11(4):e5. doi: 10.5037/jomr.2020.11405. eCollection 2020 Oct-Dec.
The aim of this retrospective study was to evaluate the relation of the infraorbital canal course with the maxillary sinus using cone-beam computed tomography.
A total of 1000 infraorbital canals (IOC) were examined from 500 cone-beam computed tomography scans. IOCs were classified into three types based on the degree of protrusion into the sinus. The presence of Haller cells and mucosal thickening in the sinus were evaluated. The length of bony septum from the canal to the sinus wall (D1), the distance at which protrusion begins posterior to the inferior orbital rim (D2), the vertical distance from the canal to the sinus roof (D3), and the vertical distance from the canal to the sinus floor (D4) were measured.
The prevalence of IOC protrusion into the sinus was 8.8%. There was a significant difference in the prevalence of Haller cells between IOC types (P < 0.01). However, no significant correlation was found between IOC types and the presence of mucosal thickening (P > 0.05). There was no significant difference in the mean D1, D2, and D3 between the genders (P > 0.05). The mean D4 was significantly higher in males than in females (P < 0.05).
The protrusion of infraorbital canals into the sinus is a common variation that must be considered to prevent accidental injury. Our findings suggest that the risk of injury to the descending canals is very low during routine dentoalveolar procedures because the protruded canal is not close to the sinus floor.
本回顾性研究旨在使用锥形束计算机断层扫描评估眶下管走行与上颌窦的关系。
从500例锥形束计算机断层扫描中检查了总共1000条眶下管（IOC）。根据眶下管突入窦内的程度将其分为三种类型。评估窦内Haller气房的存在及黏膜增厚情况。测量从眶下管至窦壁的骨间隔长度（D1）、眶下缘后方突入开始处的距离（D2）、眶下管至窦顶的垂直距离（D3）以及眶下管至窦底的垂直距离（D4）。
眶下管突入窦内的发生率为8.8%。不同类型眶下管中Haller气房的发生率存在显著差异（P < 0.01）。然而，眶下管类型与黏膜增厚的存在之间未发现显著相关性（P > 0.05）。性别之间D1、D2和D3的平均值无显著差异（P > 0.05）。男性的D4平均值显著高于女性（P < 0.05）。
眶下管突入窦内是一种常见变异，在预防意外伤害时必须予以考虑。我们的研究结果表明，在常规牙槽手术中，下行管损伤的风险非常低，因为突入的眶下管不靠近窦底。
